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Forum: Pentax K-S1 & K-S2
04-21-2017, 09:26 PM
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While all of the above complexities are true, the bottom line simple answer to your question is yes- if you want to get approximately what a full-frame camera sees with a 50mm lens, get a 35mm lens for your APS-C size sensor DSLR.
Digitally optimized for APS-C is not about focal length. It simply means the lens circle is cut smaller than for a full frame sensor so as to fit the parameters of the APS-C size, which allows for a somewhat smaller lens to be designed. It also means putting that lens on a FF body would likely result in darkness around the edges of the image because the glass is too small across. But there is no problem using a lens made for FF on an APS-C body, even though bigger across than needed- that extra lens area is simply not being used.
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